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  <a name="gaussdbT_00069-2"></a><a name="gaussdbT_00069-2"></a>
  <h1 class="topictitle1">恢复GaussDB T集群</h1>
  <div>
   <p>当需要对已备份的、类型为GaussDB T集群的数据库进行恢复时，可以参考本节使用副本恢复数据库至原位置或新位置。</p>
   <div class="section">
    <h4 class="sectiontitle">前提条件</h4>
    <p id="gaussdbT_00069-2__gaussdbt_00069_p163281625103616">当数据库服务状态为“在线”、“降级”、“不可用”，且数据库服务所在节点状态为“在线”时，可以进行恢复操作。</p>
   </div>
   <div class="section">
    <h4 class="sectiontitle">注意事项</h4>
    <p id="gaussdbT_00069-2__gaussdbt_00069_p189391716181616">恢复前请确保恢复目标位置的数据目录剩余空间大于恢复副本缩减前大小，否则恢复将失败。</p>
   </div>
   <div class="section">
    <h4 class="sectiontitle">操作步骤</h4>
    <ol id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_ol115861512165614">
     <li id="gaussdbT_00069-2__zh-cn_topic_0000001263936798_li10796132225712"><span>选择<span class="uicontrol" id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00065_zh-cn_topic_0000002199964685_uicontrol137901542165417">“<span id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00065_zh-cn_topic_0000002199964685_text4790154220547">数据利用</span> &gt; <span id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00065_zh-cn_topic_0000002199964685_text15790114235419">副本数据</span> &gt; <span id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00065_zh-cn_topic_0000002199964685_text9626515124917">数据库</span> &gt; <span id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00065_zh-cn_topic_0000002199964685_text193013119308">GaussDB T</span>”</span>。</span></li>
     <li id="gaussdbT_00069-2__gaussdbt_00069_li87691438131514"><span>支持以资源维度或以副本维度查找副本，本节以资源维度为例进行说明。</span><p></p><p id="gaussdbT_00069-2__gaussdbt_00069_p142551140161511">在“<span id="gaussdbT_00069-2__gaussdbt_00069_text6827103218214">资源</span>”页签，根据数据库名称查找到需要恢复的数据库，并单击数据库名称。</p> <p></p></li>
     <li id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_li182120214713"><span>在<span class="uicontrol" id="gaussdbT_00069-2__gaussdbt_00069_uicontrol1812414562220">“<span id="gaussdbT_00069-2__gaussdbt_00069_text18993182162710">副本数据</span>”</span>页面，依次选择年、月、天找到副本。</span><p></p><p id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_p9918150182310">当时间上显示<span><img id="gaussdbT_00069-2__gaussdbt_00069_image6372127414" src="zh-cn_image_0000002199967441.png"></span>，即表示该月、该天存在副本。</p> <p></p></li>
     <li id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_li2098620343715"><span>在副本所在行，单击<span class="uicontrol" id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_uicontrol17834155014018">“<span id="gaussdbT_00069-2__gaussdbt_00069_text3935161010423">更多</span> &gt; <span id="gaussdbT_00069-2__gaussdbt_00069_text388813503428">恢复</span>”</span>。</span><p></p>
      <ul id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_ul46503661812">
       <li id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_li9651136131814">恢复数据库实例至原位置。 
        <div class="tablenoborder">
         <table cellpadding="4" cellspacing="0" summary="" id="gaussdbT_00069-2__gaussdbt_00069_table10161134615197" frame="border" border="1" rules="all">
          <caption>
           <b>表1 </b>恢复GaussDB T数据库实例至原位置
          </caption>
          <colgroup>
           <col style="width:32.53%">
           <col style="width:67.47%">
          </colgroup>
          <thead align="left">
           <tr id="gaussdbT_00069-2__gaussdbt_00069_row116194613197">
            <th align="left" class="cellrowborder" valign="top" width="32.53%" id="mcps1.3.4.2.4.2.1.1.1.2.3.1.1"><p id="gaussdbT_00069-2__gaussdbt_00069_p151611462191">参数</p></th>
            <th align="left" class="cellrowborder" valign="top" width="67.47%" id="mcps1.3.4.2.4.2.1.1.1.2.3.1.2"><p id="gaussdbT_00069-2__gaussdbt_00069_p1316114691914">说明</p></th>
           </tr>
          </thead>
          <tbody>
           <tr id="gaussdbT_00069-2__gaussdbt_00069_row19161204621915">
            <td class="cellrowborder" valign="top" width="32.53%" headers="mcps1.3.4.2.4.2.1.1.1.2.3.1.1 "><p id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_p421028152915">并发进程数</p>
             <div class="note" id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_note137601255152715">
              <span class="notetitle"> 说明： </span>
              <div class="notebody">
               <p id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_p1176010553271">仅1.6.0及后续版本支持该参数。</p>
              </div>
             </div></td>
            <td class="cellrowborder" valign="top" width="67.47%" headers="mcps1.3.4.2.4.2.1.1.1.2.3.1.2 ">
             <div class="p" id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_p284323634310">
              并发运行的最大进程数。
              <ul id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_kingbase-00019_ul441812321262">
               <li id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_kingbase-00019_li168933916267"><span style="color:#282B33;">适当的设置可以提高备份或还原的效率，太高的设置会影响数据库实例本身的性能。</span></li>
               <li id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_kingbase-00019_li9418632172612"><span style="color:#282B33;">建议将最大进程数设置为CPU内核数。</span></li>
              </ul>
             </div> <p id="gaussdbT_00069-2__gaussdbt_00069_kingbase-00081_p1322615422614"></p></td>
           </tr>
          </tbody>
         </table>
        </div></li>
       <li id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_li211144814180">恢复数据库实例至新位置。<p id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_p20231853141612"><a name="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_li211144814180"></a><a name="gaussdbt_00069_zh-cn_topic_0000001263936798_li211144814180"></a>相关参数说明如<a href="#gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_table93951625101715">表2</a>所示。</p>
        <div class="tablenoborder">
         <a name="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_table93951625101715"></a><a name="gaussdbt_00069_zh-cn_topic_0000001263936798_table93951625101715"></a>
         <table cellpadding="4" cellspacing="0" summary="" id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_table93951625101715" frame="border" border="1" rules="all">
          <caption>
           <b>表2 </b>恢复GaussDB T数据库实例至新位置
          </caption>
          <colgroup>
           <col style="width:32.53%">
           <col style="width:67.47%">
          </colgroup>
          <thead align="left">
           <tr id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_row53951325131711">
            <th align="left" class="cellrowborder" valign="top" width="32.53%" id="mcps1.3.4.2.4.2.1.2.2.2.3.1.1"><p id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_p173952253171">参数</p></th>
            <th align="left" class="cellrowborder" valign="top" width="67.47%" id="mcps1.3.4.2.4.2.1.2.2.2.3.1.2"><p id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_p203951725141711">说明</p></th>
           </tr>
          </thead>
          <tbody>
           <tr id="gaussdbT_00069-2__gaussdbt_00069_row20642038151510">
            <td class="cellrowborder" valign="top" width="32.53%" headers="mcps1.3.4.2.4.2.1.2.2.2.3.1.1 "><p id="gaussdbT_00069-2__gaussdbt_00069_p9786123578">标签</p>
             <div class="note" id="gaussdbT_00069-2__gaussdbt_00069_note11548318195710">
              <span class="notetitle"> 说明： </span>
              <div class="notebody">
               <p id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_p1176010553271">仅1.6.0及后续版本支持该参数。</p>
              </div>
             </div></td>
            <td class="cellrowborder" valign="top" width="67.47%" headers="mcps1.3.4.2.4.2.1.2.2.2.3.1.2 "><p id="gaussdbT_00069-2__gaussdbt_00069_p8641538151516">资源关联的标签名称，可通过标签筛选数据库。</p></td>
           </tr>
           <tr id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_row6884113111815">
            <td class="cellrowborder" valign="top" width="32.53%" headers="mcps1.3.4.2.4.2.1.2.2.2.3.1.1 "><p id="gaussdbT_00069-2__gaussdbt_00069_p2130181513019">目标位置</p></td>
            <td class="cellrowborder" valign="top" width="67.47%" headers="mcps1.3.4.2.4.2.1.2.2.2.3.1.2 "><p id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_p1988443121811">选择恢复到的目标位置。</p></td>
           </tr>
           <tr id="gaussdbT_00069-2__gaussdbt_00069_row148511955244">
            <td class="cellrowborder" valign="top" width="32.53%" headers="mcps1.3.4.2.4.2.1.2.2.2.3.1.1 "><p id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_p421028152915">并发进程数</p>
             <div class="note" id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_note137601255152715">
              <span class="notetitle"> 说明： </span>
              <div class="notebody">
               <p id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_p1176010553271_1">仅1.6.0及后续版本支持该参数。</p>
              </div>
             </div></td>
            <td class="cellrowborder" valign="top" width="67.47%" headers="mcps1.3.4.2.4.2.1.2.2.2.3.1.2 ">
             <div class="p" id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_p284323634310">
              并发运行的最大进程数。
              <ul id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_kingbase-00019_ul441812321262">
               <li id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_kingbase-00019_li168933916267"><span style="color:#282B33;">适当的设置可以提高备份或还原的效率，太高的设置会影响数据库实例本身的性能。</span></li>
               <li id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_kingbase-00019_li9418632172612"><span style="color:#282B33;">建议将最大进程数设置为CPU内核数。</span></li>
              </ul>
             </div> <p id="gaussdbT_00069-2__gaussdbt_00069_gaussdbt_00069_kingbase-00081_p1322615422614"></p></td>
           </tr>
          </tbody>
         </table>
        </div>
        <div class="note" id="gaussdbT_00069-2__gaussdbt_00069_note1667603815313">
         <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
         <div class="notebody">
          <p id="gaussdbT_00069-2__gaussdbt_00069_p76762381533">恢复过程中，系统将关闭目标位置数据库服务。</p>
         </div>
        </div></li>
      </ul> <p></p></li>
     <li id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_li1481714307166"><span>单击<span class="uicontrol" id="gaussdbT_00069-2__gaussdbt_00069_zh-cn_topic_0000001263936798_uicontrol194684162818">“<span id="gaussdbT_00069-2__gaussdbt_00069_text17204857111715">确定</span>”</span>。</span></li>
    </ol>
   </div>
   <p></p>
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